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I think you are correct, as it looks like Columbus Max, tho I think seatstays were probably reshaped and used in a “fastback” construction that I’ve never seen on a Max frame before. What’s more intriguing is the top tube. Head tube end is diamond-shaped (reminds me a lot of De Rosa chain stays) whereas the other end has a shape of Columbus Max top tube. Front fork is a huge uncertainty. What was the building process of this frame remains a secret but the result is really exotic and interesting.
Pawlus
It‘s Max Tubing, not MS. I‘m not sure about the seatstays and the forks are definitely not max but the rest is max. Lugged max frames also use a proprietary bb, similar to the MS one. MS has assymetrical chainstays and a teardrop-shaped downtube whereas max chainstays have the same shape and the downtube is ovalised.
MS bb shell, note the assymetric chainstays shapes:
Max BB:
@Scilly.Suffolk true, mix and match was common but with lugged MS and Max frames, the dt and chainstays had to be from the same tubeset due to the proprietary bb shell. it was fairly common to use other seatstays for example. My cyfac max and the merckx mxl use round non-max seatstays for example.